Malicious PDF — malware analysis report

Static analysis result for SHA-256 f417fe86912323a2…

MALICIOUS

PDF

41.8 KB Created: 2021-05-05 13:09:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c50b31446d531f50b5163811772d1283 SHA-1: 6b7a139fdea0e9d21bd14c7bfd38e21a0c8cfb41 SHA-256: f417fe86912323a2c770cd33490cb30cc08659610e9f11abf848637a52772034
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure related to 'free Robux' and 'game hacks' to entice users. It contains multiple embedded URLs that point to redirectors and other PDF files, indicating a phishing or social engineering attack. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/free-robux-games-on-roblox-2021-game-hack In PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-roblox-client.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-lucky-patcher.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/roblox-obc-hack-download.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hacks-de-roblox-prueba.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-august.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/is-there-any-working-robux-hacks-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-robux-hack-free-robux-generator.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hack-and-slash-roblox-ghostemane.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-hack-kick-gui-juin-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-2021-no-survey.pdfIn PDF document text
    • https://freerobux.cyouIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004309.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4309 27116 bytes
SHA-256: ab6b14273e4f88ce23a239c6470983d7add2bf7bc43be69a0904e62e447df196
font_01_sfnt_off00007fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBD 18976 bytes
SHA-256: f1c2a77bcde00c997becd44eaf7c3ae4dc59b80ed56d87f17575c93baf431d4b

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